<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div id="app">
        <div :class="['box', a]">111</div>
        <div :class="{a: 1==1, b: false, active: isActive}">222</div>
        <div :class="['box', a, {a: 1==1, b: false, active: isActive}]">333</div>
    </div>

    <script src="./vue.global.js"></script>
    <script>
      const { createApp } = Vue;
      const app = createApp({
        data() {
          return {
            a: 'box2',
            isActive: true
          };
        },
      });
      app.mount("#app");
    </script>
  </body>
</html>
